Carburetor



S. C. SMITH Feb. 2,6,` 1935.

CARBURETOR Filed March 11, 1951 I l Q W INVENTOR. STUYVESA/v `S/v/mf ATTORNEY.

Patented Feb. 2,6, 191:55

UNITED STATES lPATENT 'OFFICE cannunn'ron Application March( 11,

9- Claims.

This invention relates to fuel vaporizers and is illustrated as embodied in an internal combustion engine carburetor.

An object of the invention is to provide a carburetor in which the vaporizer is automatically operated when needed, by interconnecting it with some other device that is ordinarily used for engine starting purposes, such as the carburetor choke valve.

A feature of the invention relates to the interconnection of an electric vaporizer with the choke valve control.

Another feature relates to the interconnection of the vaporizer switch with the vaporizer fuel valve whereby both are actuated concurrently.

Another feature of the invention relates to the interconnection of the choke valve the vaporizer switch and the vaporizer fuel valve.

Other features and objects of the invention will be apparent from the following description in -connection with which I have illustrated a preferred embodiment in the accompanying drawing in which:

Figure 1 is a side elevation of a carburetor showing a manually controlled choke valve which is interconnected with the operating parts of a fuel vaporizer;

Figure 2is an enlarged vertical section of the vaporizer shown in Figure 1;

Figure 3 is a top plan view of the .vaporizer showing its method of attachment to the carburetor; and K Figure 4 is a perspective view of one of the attaching screws.

In the drawing, the vaporizer is generally designated by l0 and is mounted on the side of the carburetor 12 from which it receives its supply of fuelI through a conduit 14 having a connection with the float chamber bowl 16. The choke valve 18 is controlled by a manually operable rod 20 which rotates lever 22 that is secured to the valve shaft 24. The vaporizer comprises a body por'- tion 26 within which is a valve 28 adapted to control theK fuel orice 30. The upper portion of valve 28 is connected to the operating lever 22 by a flexible cable 32 which passes over pully 34 and is secured to the lever 22 in any desired manner. f

, Heat is supplied to the vaporizer by means of a. coil 36 having its lower end grounded on the body portion of the pump by screw 38 and its upper end connected to insulated screw 40. A depending prong 41 is provided on screw 40 in electrical connection therewith and a similar prong 42 on the opposite side of the vaporizer is connected 1931, Serial N0. 521,758

to a source of electrical current l(not shown)- through insulated 'screw'44 and cable 46 having a terminal 48. Metallic'washer 50 is slldably mounted on valve stem 28 and insulated therefrom by collar 52 which isadapted to contact with both prongs 41 and 42 and permit current to flowJ through coil 36 andheat the fuel contained in the vaporizer. Washer 50 is preferably mounted between springs and 62, spring 60 being arranged to coact with the upper portion of the vaporizer, and spring 62 being arranged to abut washer 64 which engages theprejections 65 on valve stem 28. The vaporizer is preferably secured to thel body of the carburetor by means of screws 66 which have a passageway 68 in communication with reduced portions 10 by means of holes 72. Reduced portions 'i0 are in communication with vertical holes 73 formed in the head '74 of the vaporizer whereby communication is established between the vaporizer and the mixing chamber 76 of the carburetor.

In the `operation of the device, control 20 is operated to move valve 18 in a counterclo'ckwise direction and lift valve stem 28 to its upper position to open orifice 30 and cause washer 50. to contact with the prongs 41 and 42. Under these conditions fuel will flow into the vaporizer and be heated by the coil 36 and the vapor generated will pass upwardly through the openings 73 in the head 74 and through passages 68 into the mixing chamber '16. It will be noted that in a single movement of the control member 20, the choke valve is closed, the vaporizer fuel valve opened and the heating electrical circuit established. It will also be noted that washer 50 is not positively connected to the valve stem 28 and that after the switch is closed, additional movement of the control 20 will lift valve stem 28 without disturbing the electrical connection.

While I have illustrated andl described a preferred embodiment of the invention, it is to be understood that this showing and description are illustrative only, and that I do not regard thev invention as limited by the forms shown and de scribed, except by the terms of the following claims:

' I claim: g

1. A carburetor comprising a choke valve having a' control, a fuel vaporizer having a heating coil, a switch therefor, a fuel valve, a single means for operating the choke control, vaporizer switch and valve, and means including a resilient connection between the switch and fuel valve 4whereby movement of either valve is not restricted by the switch closure.

2. A carburetor comprising a choke valve, a fuel reservoir, an electric heater therefor having separated contacts, a fuel valve, a switch member slidable on the fuel valve for interconnecting the contacts, means resiliently urging the switch member toward the contacts when the fuel valve is opened, and a connection between fuel and choke valves whereby the valves and switch are moved concurrently.- 4

3. A carburetor comprising a choke valve, a fuel vaporizer, an electric heater therefor having separated contacts, a fuel valve, a switch member slidable on the fuel valve for interconnecting the contacts, a spring between rthe switch member and a stop on the fuel valve, and a connection between the valves whereby the valves and switch are moved concurrently.

4. A carburetor comprising a choke valve, a fuel vaporizer having a fuel valve additional to the normal fuel supplying means of the carburetor, an electric heater having a switch, and means interconnecting the valves and switch arranged to positively actuate the choke valve and fuel valve and to resiliently close the switch after the fuel valve has opened.

5. A carburetor, comprising a carbureting passage having an air inlet, an auxiliary fuel receptacle having a discharge outlet in the carbureting passage and having a fuel inlet, heating means for the fuel receptacle, and common means for controlling the air inlet, fuel inlet, and heating means.

6. A carburetor comprising a carbureting passage and a choke valve, a fuel receptacle having an outlet communicating with the carbureting passage and having a fuel inlet, means for changing the state of the fuel in the fuel receptacle, and manually operable common means for controlling the choke valve, the fuel inlet, and the changing means.

'7. A carburetor for an automotive vehicle comprising a carbureting passage, a choke valve, an auxiliary fuel receptacle having an outlet communicating with the carbureting passage and having a fuel inlet, an electrical heating element in the fuel inlet, a switch for the heating element, and common means within reach of the driver of the vehicle for simultaneously closing said choke valve, opening said fuel inlet, and closing said switch.

8. A carburetor comprising an induction passage and means for supplying fuel thereto for the normal operation of the carburetor, a choke valve controlling the admission of air to the induction passage, a fuel vaporizer discharging into said induction passage and comprising a heating element, a fuel valve controlling the admission of fuel to said vaporizer, and common means for simultaneously closing the choke valve, rendering the heating element operative, and opening the fuel valve.

9. A device as defined in claim 8, wherein the common means comprises a lost motion connection between the heating element control and the fuel valve to permit the degree of opening of said fuel valve to be varied without affecting the operation of the heating element.

STUYVESANI' C. SMITH. 

